python / cpython

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* Update math.rst

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Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>

… flags passed (#18314)" (GH-18553)

This reverts commit d83b660.

…es in the collections module. (GH-10596)" (GH-18545)

This reverts commit ef092fe.

Update collections __getattr__() and documentation to defer aliases
removal to Python 3.10.

This continues the `range()` part of #13930. The complete pull request is stalled on discussions around dicts, but `range()` should not be controversial. (And I plan to open PRs for other parts if this is merged.)
On top of Mark's change, I unified `range_new` and `range_vectorcall`, which had a lot of duplicate code.


https://bugs.python.org/issue37207

The constants `RESTRICTED` and `PY_WRITE_RESTRICTED` no longer have a meaning in Python 3. Therefore, CPython should not use them.

CC @matrixise 


https://bugs.python.org/issue36347

…PEP 489) (GH-18050)

https://bugs.python.org/issue1635741

…ars (GH-18337)

When `allow_abbrev` was first added, disabling the abbreviation of
long options broke the grouping of short flags ([bpo-26967](https://bugs.python.org/issue26967)).  As a fix,
b1e4d1b (contained in v3.8) ignores `allow_abbrev=False` for a
given argument string if the string does _not_ start with "--"
(i.e. it doesn't look like a long option).

This fix, however, doesn't take into account that long options can
start with alternative characters specified via `prefix_chars`,
introducing a regression: `allow_abbrev=False` has no effect on long
options that start with an alternative prefix character.

The most minimal fix would be to replace the "starts with --" check
with a "starts with two prefix_chars characters".  But
`_get_option_tuples` already distinguishes between long and short
options, so let's instead piggyback off of that check by moving the
`allow_abbrev` condition into `_get_option_tuples`.





https://bugs.python.org/issue39546

Test when find_good_parse_start should return 0.

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>

…9) (GH-18030)

…EP 489) (GH-18374)

…H-18521)

…n (PEP 489) (GH-18404)

…assed (#18314)

* Hard reset + cherry piciking the changes.

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* Added @vstinner News

* Update Misc/NEWS.d/next/Library/2020-02-11-13-01-38.bpo-38691.oND8Sk.rst

Co-Authored-By: Victor Stinner <vstinner@python.org>

* Hard reset to master

* Hard reset to master + latest changes

Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>
Co-authored-by: Victor Stinner <vstinner@python.org>

…H-18514)

…6458)

…ckling failure (GH-17670)

As reported initially by @rad-pat in #6084, the following script causes a deadlock.

```
from concurrent.futures import ProcessPoolExecutor


class ObjectWithPickleError():
    """Triggers a RuntimeError when sending job to the workers"""

    def __reduce__(self):
        raise RuntimeError()


if __name__ == "__main__":
    e = ProcessPoolExecutor()
    f = e.submit(id, ObjectWithPickleError())
    e.shutdown(wait=False)
    f.result()  # Deadlock on get
```

This is caused by the fact that the main process is closing communication channels that might be necessary to the `queue_management_thread` later. To avoid this, this PR let the `queue_management_thread` manage all the closing.



https://bugs.python.org/issue39104



Automerge-Triggered-By: @pitrou

Update PyXXX_Check() macros in Include/ to use
the new Py_IS_TYPE function.

… *. (GH-18510)

Setting `-D_XOPEN_SOURCE=700` on HP-UX causes system functions such as chroot to be undefined.  This change stops `_XOPEN_SOURCE` begin set on HP-UX

Co-authored-by: Benjamin Peterson <benjamin@python.org>

…-18456)

https://bugs.python.org/issue39545

(Adapted from python/typing#700)

Co-Author: Neil Schemenauer <nas-github@arctrix.com>

…-18475)

The fix for [bpo-39386](https://bugs.python.org/issue39386) attempted to make it so you couldn't reuse a
agen.aclose() coroutine object. It accidentally also prevented you
from calling aclose() at all on an async generator that was already
closed or exhausted. This commit fixes it so we're only blocking the
actually illegal cases, while allowing the legal cases.

The new tests failed before this patch. Also confirmed that this fixes
the test failures we were seeing in Trio with Python dev builds:
  python-trio/trio#1396


https://bugs.python.org/issue39606

…`resource`, `shutil`, `signal`, `syslog` (GH-18407)

Move CPython C API from Include/fileutils.h into a new
Include/cpython/fileutils.h header file which is included by
Include/fileutils.h.

Exclude the following private symbols from the limited C API:

* _Py_error_handler
* _Py_GetErrorHandler()
* _Py_DecodeLocaleEx()
* _Py_EncodeLocaleEx()

Add Include/cpython/bytearrayobject.h and
Include/cpython/bytesobject.h header files.

Move CPython C API from Include/bytesobject.h into a new
Include/cpython/bytesobject.h header file which is included by
Include/bytesobject.h. Do a similar change for
Include/bytearrayobject.h.